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Published on: October 30, 2013
Ras mutation cooperates with β-catenin activation to drive bladder tumourigenesis
1Department of Uro-oncology, The Beatson Institute for Cancer Research, Glasgow G61 1BD, Scotland.
Cell Death & Disease
|March 4, 2011
Summary
Ras pathway activation and Wnt signaling cooperate to drive urothelial cell carcinoma (UCC) progression. Combining these mutations in mice rapidly caused UCC, sensitive to MEK inhibition.
Area of Science:
- Oncology
- Molecular Biology
- Urology
Background:
- Ras mutations are common in urothelial cell carcinoma (UCC), but alone do not always cause tumors.
- Wnt signaling is also frequently altered in UCC.
- The interplay between Ras and Wnt pathways in UCC progression is not fully understood.
Purpose of the Study:
- To investigate the correlation between MAPK and Wnt signaling in human UCC.
- To determine the functional significance of combined Ras and Wnt pathway activation in UCC development.
- To explore therapeutic strategies targeting this cooperative pathway activation.
Main Methods:
- Analysis of signaling pathway correlations in human UCC samples.
- Generation of genetically engineered mouse models (Cre-LoxP) with combined Ras and β-catenin mutations.
- Assessment of tumor development, molecular mechanisms (p21, p-ERK), and therapeutic response (MEK inhibition).
Main Results:
- A significant correlation was found between MAPK and Wnt signaling activation in human UCC.
- Combined Ras and β-catenin mutations in mice rapidly induced UCC, unlike individual mutations.
- Tumor development was mechanistically linked to reduced p21 levels and MAPK pathway dependence.
- Tumors exhibited sensitivity to MEK inhibition.
- Human UCC showed a negative correlation between p-ERK and p21 levels.
Conclusions:
- Ras pathway activation cooperates with Wnt signaling to drive urothelial cell carcinoma (UCC) in vivo.
- The combination of these mutations leads to UCC development through reduced p21 and MAPK pathway activation.
- Targeting MEK offers a potential therapeutic strategy for UCC driven by Ras and Wnt cooperation.
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